<div class="tutorial-summary" data-metadata-json='{"difficulty": "medium", "groupedProjectAssets": [{"name": "space invaders", "assets": ["enemy-alien.png", "friendly-alien.png", "special-alien.png"]}]}'><p class="image-container"><img alt="Screenshot" src="screenshot.png"/></p>
<h1>Blue Invaders</h1>
<p>In this game we'll defend ourselves from dangerous blue invaders, by
clicking on them.  But don't destroy the friendly green aliens by
mistake!</p></div>